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Popular >

expand (9x-7)^2

Solution

expand

(9 x - 7)^{2}

Solution

81 x^{2} - 126 x + 49

Solution steps

(9 x - 7)^{2}

Apply Perfect Square Formula:

(a - b)^{2} = a^{2} - 2 ab + b^{2}

(9 x - 7)^{2} = (9 x)^{2} - 2 \cdot 9 x \cdot 7 + 7^{2}

= (9 x)^{2} - 2 \cdot 9 x \cdot 7 + 7^{2}

Simplify

(9 x)^{2} - 2 \cdot 9 x \cdot 7 + 7^{2} : 81 x^{2} - 126 x + 49

= 81 x^{2} - 126 x + 49

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Frequently Asked Questions (FAQ)

What is expand (9x-7)^2 ?
The solution to expand (9x-7)^2 is 81x^2-126x+49